Answer :
Final answer:
Multiple alleles, like those in the ABO blood-type system, involve three or more alleles determining a trait.
Explanation:
Multiple alleles refer to a situation in which a gene has three or more alleles. An example of multiple alleles is the ABO blood-type system in humans, where the IA, IB, and i alleles determine the blood type. In this system, IA and IB alleles are codominant with each other and both dominant over the i allele.
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